Safety device for crushers



3 Sheets-Sheet 1 Oct. 19 1926.v

J. S. HAAS ET AL SAFETY DEVICE FOR CRUSHERS Filed May 27'l 1926 oct. 19,1926. 1,603,765

J. S. HAAS ET AL.

SAFETY DEVICE' FOR CRUSHERS Filed May 27, 1926 3 Sheets-Sheet 2 oct., 19 ,1926. www5 J. S. HAAS ET AL SAFETY DEVICE. FOR CRUSHERS Filed May 27. 1926 3 Sheets-Sheet 5 Athrough a swing jaw crusher'.

Patented Oct. i9, 1926.

UNITED STATE 1,593,765 PATENT QFFICE.

JGHN S. HAAS AND RICHARD BERNHARD, OF ALLENTOW'N, PENNSYLVANA, AS- SIGNORS TO TRAYLOR ENGINEERIG da IYIIVFACTURING COMPANY, 'OF ALLEN- 'I'OVJN, PENNSYLVANIA, A CORPORATION 0F DELAVARE.

SAFETY DEVICE FOR CRUSHERS.

Application led May 27,

lthe same.

Such Crushers require some protecting means which will serve to prevent damage to the parts'when some practically unbreakable substance, such as f tramp. iron enters l2 the space between the crushing Jaws, which,

without such protection, result s in material and costly damage in the nature of fracture of the swing jaws, or breakage of the pitman or toggle levers, or the straining or rupture of the frame. The damage is largely due to the fact that there is a great inertia .stored in the moving parts which are very heavy and when movement is suddenly checked by such unbreakable substance the weakest part must give way. Such sudden stoppage of the moving parts frequently exerts forces ten times greater than that required for breaking rock'or ore.

The present invention aims to provide a safety device which will effectually prevent damage to the crusher parts under such circumstances, and this in the shape of simple.

and economical means which may be readily applied to or incorporated in the standard types of Crushers.

The invention further aims to provide means which may be readily manipulated to place the crusher in readiness for operationl after the safety device has operated to prevent breakage on encountering an obstacle beyond the capacity of the crusher.

Still another object is to provide a device of this character in which the maximum resistance point may be readily varied when desired and according t circumstances.

With these and other objects in View the invention includes the novel construction and arrangement 'and combination of parts hereinafter described, the nature and scope ot our invention being set forth in and de- `lined by the claims appended hereto.

That we at present consider the preferred embodiment of our invention is illustrated in the accompanying drawings in which- Figure lv is alongitudinal vertical section Fig. 2 is a section on line 5,2-2 of Fig. l'

4 partly broken away, i,

1926. Serial No. 112,173.

Fig. 3 is a view of a modification, and

Fig. t is a view of a further modification.

As `this crusher is of the standard type and will be well understood by those skilled in the art from a mere inspection of the drawings, no attempt will be made herein to describe it in detail.

It su'iices to say that l and 2 are the iixed and swing jaws respectively, the latter being operated from the cam shaft 3 through the intermediary of the pitman l and toggle .links or levers 5.

According to our invention we interpose at some point in the press between a power thrust member and a thrust resisting or thrust actuated member, a punch which acts against an imperforate plate or bar of such resistance to punching action as will enable the crusher to function normally, but which plate or bar, on the entry of a relatively unbreakable substance between the jaws, will allow the punch to pass therethrough.

A convenient manner of incorporating this punch or plate is shown in Figs. l and 2, in which the rocker or cross head 6 of the pitman is'boredor recessed to receive a plunger 7 which plunger acts to yapply pressure to the knee of the toggle rthrough a pivot bar ?L secured thereto.

The plunger is fitted with a punch 8 which may be held in place by a taper or drive tit in a recess in the under side of the plunger.

The rocker or cross head 6 is provided with a steel die 9 having an opening 9a which corresponds in size to the die and to opening 6a and is aligned therewith due to the sliding fit of the plunger in the bore of the rocker.

The rocker is provided with a transverse passageway 6b to receive a bar l() of material adapted to resist the punching action of punch 8 up tothe desired pointof resistance, such as a bar or plate of mild steel, and it is normally locked in position by releasable means such as set screw 1l. As old scrap material may be used for the bar l0 the cost thereof is negligible. Y

When the bar l0 is in place as shown in Figs. l and 2, all the parts are kept in contact during the operation of the press by the customary spring `iack: l2, and by the retracting springs 13 of the swing jaw 2.

When tramp iron hasfallen into the crusher and the machine is in motion, the punch passes through the safety bar and the slug that is punched out falls out of the pitman rocker. The toggles immediately drop and the inner end of the fronttoggle immediately falls until the swing `jaw 2 is arrested by and rests on the two adjustable stop screws 141 on each side of the crusher only one of which appears in the drawing at the left of Fig. 2. The pitman now continues to operate, but instead of lifting the toggles to 'move the jaw forward, it simply works up In order to commence crushing, it is necessary to stop the machine, take out the tramp iron, if same is still in the machine, and after the Crusher has been cleaned, a jack is used under the Crusher to lift the toggles into closed position, the pitman being in its lowest position. A bar is then inserted underneathl the punch, and punch and plunger are lifted and held in highest position. The set screw 11 holding safety bar is then released and the bar is moved in either direction to present a new surface for punch.

The bar is then secured by the set screw 11 to prevent its moving. The jack holding the toggle is then released to allow the punch to come in contact with the safety bar, and thereby support the vplunger and toggles. The machine is then ready to operate. This change can be made in a very short time and if a lifting jack for the toggles and wrenches is handy, the safety bar may be moved over in five minutes. It will be seen that the expense of maintaining the safety device is eX- ceedingly low and the loss of time practically negligible.

lVhile crushers may sometimes run for considerable time'without encountering unbreakable substances, they may again receive such often and in some instances have been known to do so several times in one hour. Hence an economical safety device such as disclosed, and one which after it has functioned, is of such a nature that the Crusher can be readily restored to normal condition, is an extremely important factor.

It will be obvious that we do not limit ourselves to incorporating the punch in the pitmanras' disclosed in 1 and 2, as it may be placed in any position 'between a thrusting and a thrusttransmitting member. For example, it may be placed between the main frame part 15 and the part or toggle block 1G, which receives the thrust of the rear toggle arm as shown in Fig. 3.

In this form the safety punch 8a is attached to or formed integral with the rear toggle block 16 and the abutting surfaces of the toggle block and frame part 15 are inclined relative to the line of thrust of the rear toggle arm so that the resultant upward pressure is resisted by the safety bar a which in this instance is held in a passageway in the overhanging part a of the frame member 15 similar to that described in connection with Figs. 1 and 2, and the stops 14 prevent the swing j aw from moving beyond the set distance when the safety bar is punched.

The punch of the toggle bar is kept in Contact with the safety bar in normal operation by springs 17 acting on rods 18. When the bar is perforated the block 16 slides up, due to the action of the springs and is held in high position thereby preventing the toggles from actingon the swing jawf The arrangement shown in these last named figures is particularly applicable to the larger sized crushers where the toggle thrust is of greater magnitude and the jaw is of considerable dimension.

For smaller crushers having a narrower width of jaw, the punch db may be placed on the rear toggle block 16b in horizontal alignment with the line of thrust as shown in Fig. 4f, and as the construction and operation of this will be readily apparent from this figure in the light of the foregoing specification, more specific description is deemed unnecessary.

Having thus described our invention, what we claim is:

1. In a safety device for crushers, having a fixed and a movable jaw, means for operating the movable jaw including a thrust member, and a thrust resisting member, a punch carried by one of saidinembers, the other member having an eye aligned with .said punch, a bar having an imperforate portion lying between said members and overlying said eye, and means for limiting thev opening movement of the movable j aw.

2. In a safety device for crushers, having a fixed and amovable jaw, means for operating the movable jaw including a thrust member and a thrust resisting member, a punch carried by one of said members, the other member' having an eye aligned with said punch, a bar having an imperforate portion lying between said members and overlying said eye, said bar being movably guided relative to said members to bring different portions in line with the punch, and means for limiting the opening movement of the movable jaw. Y

3q ln a safety device for' crushers, having fixed and movable jaws, means for operating" the movable jaw including a thrust member and a thrust resisting member, a punch oarried by one oi said members, the otner member having an eye aligned With said punch, and a bar having an imperforate portion lying between. said members and overlying said eye, said bar being movably guided relative to said members to bring different portions in line With the punch, means for locking said bar against movement, and means for limiting the opening movement of the movable j avv.

ln testimony whereof, We affix our signatures.

JOHN S. HAAS. RICHARD BERNHARD. 

